Mortar for stamp-mills.



No. 779,521. y PATENTED JAN. 10, 1905. M. P. BOSS.

MGRTAR PGR STAMP MILLS.

APPLICATION FILED A136331, 1903.

ZUM/ 765565. Y J/yepof UNITED STATES Patented January 10, 1905.

PATENT OEEICE.

MORTAR FOR STAMP-MILLS.

SPECIFICATION forming part of Letters Patent No. 779,521, dated January 10, 1905. Application led August 3l, 1903. Serial No. 171,341.

To all whom, t nuty concern,.-

Be it known that I, MARTIN P. Boss, a citi- Zen of the United States, residingin the city and county of San Francisco, State of California, have invented certain new and useful Improvements in Mortars for Stamp-Mills; and I do hereby declare the following to be a full, clear, and exact description of the same.

My invention relates to the general class of stamp-mills, and is particularly adapted for the more recent practice or' individual stamps, whether arranged singly or in battery, the idea being to provide each stamp with-its own complete mortar, wh ether single or in a group.

The general object of my invention is to provide a mortar of simple and economical construction, involving the important feature of a readily-replaceable body, obviating the necessity of a separate lining.

To these ends my invention consists in the novel construction, arrangement, and combination of parts, which I shall now fully describe by reference to the accompanying drawings, in which Figure l is an elevation, partly in section, of a group or battery of my mortars, the mortar on the left being in vertical section, the mortar in the middle being in elevation, and that on the right showing in elevation only the skeleton exterior frame, from which the body and the cover or top are removed. Fig. 2 is a top plan showing the mortar on the left complete, the middle one having the top or cover removed,and the one on the right showing one half in skeleton and the other half showing the screen applied to the body. Fig. 3 is a vertical section on line a' of Fig.v 2 with the addition of the top or cover.

A is a bed to be suitably anchored at (t, as seen in Fig. 2. The bed is made with the mortar-bottoms d, one or more in number. I have here shown a group of three. Each bottom is independent of the others, and each is bounded by a wall c2, as shown in Figs. 3 and 1. In the bed outside of its mortar-bottoms are made ribs a3, which extend on each side from end to end and around said ends,`as indicated in Fig. 2, thereby forming in the bed a chamber to receive the pulp, which said chamber has a discharge (Seen clearly in Fig. 3.) The walls a2 at diametrically opposite sides are continued upwardly to form columns ai. These columns, which form the skeleton or exterior frame ot the mortars, are arranged in the plane of the length of the group, so that four columns are needed for the three mortars, as is clearly seen in Figs. l and Q.

The body of each mortar is a shell composed of plate-iron, best made in sections. This body-shell is indicated by B, and in practice it is best made in two sections with planed edges, which sections when itted together form the inverted frustum of a cone. The sections are dropped down in the skeleton exterior frame formed by the columns (t5 until their bases are seated in the mortar-bottoms, as seen in Fig. 3, and each pair of sections thus form the body of the mortar. The bodyshell is drawn down and held by keys C, the hooked upper ends c of which engage its top. These keys pass down in ways in the columns c, and their lower ends are hooked, as seen in Fig. l, and are engaged bycross-keys D, suitably tapered to form a wedge and slidably secured in any convenient manner (not shown) to the columns ai. In the sections which form the body-shell B are made the openings to which the screens (one of which, E, is shown in Fig. 2) are applied directly and fastened in suitable manner, as by the keys e shown in said figure.

F is the top or cover. This is a plate having a rim-flange f, which is provided with seats for packing f', forming a joint between said rim and the upper part of the body-shell B, into which the cover F is dropped down,

as shown in Figs. 3 and l. The cover F has also a central annular uprising flange fz, which forms a housing around the stamp-head, and

Von one side of this housing-flange the cover is also formed with the hopper f3 to feed the material to the mortar.

In stamp-mill mortars the wear is very great, and to obviate the expense resulting from this it is common to provide linings which can be removed and renewed. Such linings are completely inclosed by the body of the mortar proper, which is necessarily a heavy bed-casting as a whole. In my construction, as above described, I obviate the necessity of a separate lining and reduce the mass of the bed by making the body of the mortar of plates readily attachable to and detachable from the bed, which is itself rendered as light as possible by being made simply with a skeleton supporting-frame. This bodyshell B of my mortar thus sustains the wear and is readily renewable and replaceable. When the body-shell of the mortar or of any mortar of a group becomes too much worn for further use, it is easily detached from the columns L5 of the skeleton frame by removing' the keys C and D and lifting it out.l Then a new body-shell is introduced and keyed in. This body-shell B has a further advantag'e in that it provides a g'ood face to hold the screens, and by having a number of bodies with screens applied at different heights the wear of the mortar-bottom can be followed down by selecting such bodies successively as have the height of their screens appropriate to the depth of the bottom. The top or cover F, dropping in the body as shown, is also readily removable and replaceable, and thus does not interfere with the renewing of' the body where necessary.

Having thus described my invention, what I claim as new, and desire to secure by Letters Patent, isg

1. In a mortar for stamp-mills, a solid bed having formed in it the mortar-bottom and having integral canfaliver-columns at opposite ends of a diameter of said bottom, said columns converging downwardly to a 'liange of like internal slope which surrounds said bottom.

2. In a mortar for stamp-mills, a solid bed having formed in it the mortar-bottom, and having integral cantaliver-columns at opposite ends of a diameter of' said bottom, said columns converging downwardly to a flange of like internal slope which surrounds said bottom, and a correspondingly-tapered bodyshell detachably fitted within said columns and flange.

3. In a mortar for stamp mills, having formed in it the mortar-bottom` and having' columns at the opposite ends of a diameter of' said bottom, said columns converging downwardly to a flange of like internal slope which surrounds said bottom, a eorrespondingly-tapered body-shell detachably fitted within said columns and flange, vertical keys engaging the top of the body-shell, and cross-keys slidably secured to the columns and engaging the lower ends of the vertical keys, to detachably secure said body-shell to the columns.

4. In a mortar for stamp-mills, a solid bodyY having' formed in it the mortar-bottom, and having integral cantalivercolumns at opposite ends of a diameter of said bottom, said columns converging` downwardly to a fiange of like internal slope which surrounds said bottom, a correspondingly-tapered body-shell detaehably fitted within said columns and flange, and a cover-plate having a rim-flange seated in the top of the body-shell, said coverplate having a central housing-flange for the stamp-head and a feed-hopper.

5. In a stamp-mortar, a solid base, integral cantaliver-columns carried by the same at opposite ends of a diameter of its die-face, said columns converging downwardly to a flange of like internal slope which surrounds the dieface. Y

6. In a stamp-mill mortar a solid base, integral cantaliver-columns carried by the same at opposite ends of a diameter of its die-face, said columns extending upward and terminating' in an internal fiange surrounding the dieface.

7. In a stamp-mortar, a solid base, having formed in it the mortar-bottom, integral cantaliver-columns carried by the same at opposite ends of a diameter of its bottom, said columns converging downwardly to a flange of like slope which surrounds the die-face, and the detachable body-shell fitted within said columns.

8. A mortar for stamp-mills comprising a body having formed in it the mortar-bottom, and a surrounding tapering' annular flange, and a detachable skeleton shell including a base annular rim tapered to fit within the annular flange, an upper relatively larger annular rim, and spaced members extending between and connected to the rims.

In witness whereof I have hereunto set my hand.

MARTIN P. BOSS.

Witnesses: I

WALTER F. VANE, D. B. RICHARDS. 

